Patent GB-338594-A (GB)
Abstract: 338,594. Cordt, H. Aug. 22, 1929. Adding and subtracting apparatus; multiplying and dividing apparatus; with printing - mechanism. - A machine for the four rules or for multiplication only is combined with a printing, adding and subtracting machine. Both machines have independent drives (which may in certain circumstances be coupled together), but the second machine has, in place of its keyboard, means for taking off items or calculated values from members which are positioned upon the setting or operation of the first-mentioned machine. The separate adding and printing mechanism 50, 31 is actuated by rack bars 10 to which are pivoted levers 14 having projections 14<a>, 14b, which engage with either stepped bars 2<a>, or one or other of two sets of ribbed barrels 21, 22. The stepped bars 2<a> are differentially controlled from the keyboard 1 of the machine for four rules, the ribbed barrels 21 being controlled by the product and dividend totalizers 4 and the ribbed barrels 22 by the multiplier and quotient totalizers 5. The three positions of the levers 14 are determined by a longitudinally movable bar 15, the movement of which may be controlled by the movement of the paper carriage 31. For this purpose a toothed bar 32 is attached to the carriage, and riders 33, 34, Fig. 8, are adjustably positioned upon it. These riders have projections 33<a> which depress, to different extents, a rod 36, the motion of which rod is transmitted to the bar 15 by means of levers 37, 39 and a coupling rod 38. The machine for four rules and the adding machine may be so coupled that the operation of the '' printing lever " H driving the adding and printing mechanisms effects simultaneous operation of the driving crank K of the machine for four rules, this being arranged to occur only when the levers 14 are co-operating with' the stepped bars 2<a>, the bar 15 then being in its central position. The main driving shaft 150 of the machine for four rules is connected by bevel gearing 51, 52, to a vertical shaft 53 carrying a spur wheel 54 which can engage a rack 55 pivoted at 57 to a slide 56, The rack 55 is normally withheld from contact with the wheel 54 by a spring 58. A pin 67 attached to an arm 66 secured to the printing lever shaft engages with a raised portion 65 of the slide and reciprocates the latter. A lever 60, centrally pivoted to a fixed point 59, is drawn against a stop 64 by a spring 63 and carries at its ends rollers 61, 62, the former of which can contact with the rear of the rack 55 and cause its engagement with the spur wheel 54. Attached to the printing-lever shaft is a cam 68 having forward and rear cam surfaces 68<a>, 68<b>. Rotatably mounted on the hub of the cam and connected to the latter by a spring 70 is a feeling lever 69. One end of the feeling lever forms a continuation of the cam surface 68a, and the roller 62 normally rests against it. If the bar 15 is not in its central position, the outer end of the lever 69 contacts with stops 74, 75, on the bar 15 and no movement of the lever 60 and spur wheel 54 ensues. Otherwise, the feeling lever 69 moves with the cam 68, causing the roller to ride up the cam surface, 68<a> and thus effecting the engagement of the rack 55 and spur wheel 54. At the end of the movement, the roller rides down the cam surface 68<b>, a space between this surface and the feeling lever 69 having been caused by latter being prevented from following the complete movement, of the cam 68 by its contacting with the bar 15. To ensure that a result can be transmitted to the adding and printing mechanism only when the multiplying &c. machine totalizing mechanism 3 is in its correct transverse position, the carriage for the said mechanism carries riders 78 which operate a lever 79 to displace a slotted lever 81 to allow a pin 86<a> on a lever 86 attached to the printing-lever shaft to pass through a slot 81a in the slotted lever 81. If the machine is motor driven, the lever 81 is extended beneath the key-stem 84<b> of the motor key 84, depression of this key then being possible only when the lever 79 is rocked by one of the riders 78. The totalling mechanism 50 of the adding machine may be brought into or out of engagement with the racks 10 when desired, and more than one set of totalizers may be employed.